Overshooting NDL and mandatory deco stops

[rsingler]

What about the ascent strikes you as aggressive for rec divers?

Maybe "aggressive" wasn't the most accurate term, but how about:
...being at 80 feet with only 1075 psi and a 3 minute deco obligation, and then lollygagging another 16 minutes to get to 40 feet?
...and then being at 41 feet with 375 psi and STILL having a 2-min deco obligation?

Thank you for sharing this profile! Really! We were all younger and dumber at one point in our lives. I'll presume your pucker factor was also pretty high when you hit 375?? Nice SAC rate, tho!

 

[johndiver999]

A recreational diver who has not planned for deco and probably does not have sufficient redundancy, would be advised to begin an ascent ASAP (when they first find themselves in deco). They should not rush, but staying all that time below 50-60 feet (or deeper) would be causing your slow tissue to accumulate nitrogen. I think the advice would be for the accidental deco diver to immediately discontinue the dive and concentrate on making an ascent that is as quick as is safe - especially for the portion of the ascent that is below 30- 40 feet. In other words, it would seem that the primary goal would be to clear the deco ceiling as soon as is possible, not extend the dive (even if there was enough gas supply in the only tank).

Perhaps that particular ascent was well planned and the required air was available (for an emergency), but the OP was asking about what happens if you go a few minutes past the no deco limit.

That sort of profile would not cause me any concern if it was done as a planed deco dive.

 

[dberry]

To be sure, my SAC wasn't great back then. I didn't have enough experience to know to be concerned at that point, but I was certainly relieved when the deco obligation cleared. OTOH, 3 min at 10 ft doesn't require much air (but leaves almost no margin for unexpected problems).

 

[dberry]

My point in posting the profile was to show the OP how a recreational computer responds when NDL is exceeded. I did not mean to suggest this was a smart or safe dive (although it is one that is commonly offered by some dive ops in Cozumel).

 

[scubadada]

To be sure, my SAC wasn't great back then. I didn't have enough experience to know to be concerned at that point, but I was certainly relieved when the deco obligation cleared. OTOH, 3 min at 10 ft doesn't require much air (but leaves almost no margin for unexpected problems).

I would imagine you surfaced with less than 200 psi. I've done less aggressive dives with a similar surfacing pressure, like in Bonaire, but would not think to post them for teaching purposes.

 

[rsingler]

I would imagine you surfaced with less than 200 psi. I've done less aggressive dives with a similar surfacing pressure, like in Bonaire, but would not think to post them for teaching purposes.

Well, he DID answer the OP's question, lol!

 

[dberry]

I would imagine you surfaced with less than 200 psi. I've done less aggressive dives with a similar surfacing pressure, like in Bonaire, but would not think to post them for teaching purposes.

Fair enough. The main point was to show the response of the recreational PDC to deco; I didn't consider that the air consumption sets a bad example. Mea Culpa.

 

[Mike1967]

And yes, I know I got back on the boat with less than 500 psi

A LOT less lol

 

[Centrals]

Where did I ask the default setting of my own computer? before throwing allegations please back that up with facts. You are saying something that is not true.

Post #22.
Someone asked the question on GF and your answer was "whatever the default setting". My interpretation of your reply was: No idea and please tell me what it is.
Yes, I was wrong in my interpretation.
But you do not have a clue on the setting of GF.

 

[ChuckP]

Maybe "aggressive" wasn't the most accurate term, but how about:
...being at 80 feet with only 1075 psi and a 3 minute deco obligation, and then lollygagging another 16 minutes to get to 40 feet?
...and then being at 41 feet with 375 psi and STILL having a 2-min deco obligation?

Thank you for sharing this profile! Really! We were all younger and dumber at one point in our lives. I'll presume your pucker factor was also pretty high when you hit 375?? Nice SAC rate, tho!

At 80' and 1075psi he has 3min of deco at 10' but that's a normal safety stop. I'd guess that was not an AL80 tank you were breathing.

Not making light of the deco or profile by any means - absolutely an aggressive dive and probably why Cozumel has two chambers on the island.